Lathe chuck



July 12 1927o 1,635,481 v. G. JORNER LATHE CHUCK 2 Sheetsl-Sheet 1 Filed Oct. 26, 1925 l 4 INVENTOR N Q a adorner ATTORNEYS I LATHE cnucx Filed Oct. 26. 1925 2 Sheets-Sheet 2 Z4 INVENTOR 1/. G. f0rner [Z1 N a ATTORNEYS Patented July 12, 192 7.

" I meme.- aoannmor cnioneo, rumors;

nn rnn struck:

Apb icatimeme; new as, 1925,. -Seria1 ZNo'. .65,0 l-.

I inventionjr-elatesQto improvements in lathe chucks, more; particularly in reference to the so-called wrcnchless-= chucks,-

which the jaws of. the chuck'are; movedsimultaneously by. ahandle carried'gby the. chuck, and

it consists in the. combinations,:constnuctions,

and arrangements; claimed, I

1 An objectr of my invention .isto provide a. device. in. which there is greater power in the gripping'action ot-..the chuck,1 w-ith., a giyenpull on the handle,.than with the ordi herein. described and nary chuck of the typ e which workson a cam principle.

' A further object of'my invention. is, to provide a. device/ offthe type described which will. positively grip,v theqworkz and hold it securely, and yet which may, be instantly. and easily released by amo'vfement ofthe handle, and. which will.v not sticlcas is the; case in devices. of the type. which. work .on; the

principle.

' Aturther. objectof: to 151 0. I

vi'd'e a. device ofjthe type described having relatively few. parts,.thus I rendering the device less liable to. get. out. of. order, and' fur thermore,. rendering: it; more.v economical. to manuf'acturefi 1 i I Other, objects and advantages. will appear in the following specification, and, the novel features of. the invention will be particularly pointedv outin the appended'claimse.

My-* invention is illustrated f in the accome anyingwdrawings,forming partofthisappl'icatiominwhich H I 1 Figure 1: is. a. sidevi'e'w, partly, in section, ofjone. embodiment of fmyhuok'. j I Figure 21is, ,aiface'fv-i'ew ofithelchuck shown inFignre1',

Figure 311s "an enlarged sectional detail View simi1m- 'm that shown inEiguie l ingjthe' jaw in a shifted position,

" Figure 4. isv an edge-view ot'f a' a gea-r bearing spider,

Figure 5"i's a side view'of one of the jaws,

- showing it in a reverse position, and

make use tion, as indicated in Figure 2 at: Lite-pro videtor the slidablewiaw members.

I Referringg now; particu' larly .,to;; Figures-1 l andB, it willbe seen thatthesej awscomprise 2L1StQPPGChPOIitiQIlr 5 wl'1ich is held, to-aslid;-

able block ,6 by meansof screw bolts? and 8, respecti.vely. The slidabl e block-.dis-bt the shape shown at thegbottomlof Eiglll-e LL. It! will be observed that. there *is :a, groove. 9 wl'n'jchr runs transversely, of, the, block ,6 into which attongue. 10. ofqthe 5 extends. This is for the. u rpose otformingaholding means in' .addit1on to.thebolts-fi and 8.5 The block, 61i's, of a, '|I-shape,. asshownli-nFigurti 1, .a11d1is provided with? a. semi cylindrical recess, 6, see Figure. 1,. arranged to regi ster witha similarsemicylindrical recess 11? a back. aw; Thelatter, has a;sem- 1;cyl1n- I drical recess 11! arranged. to register ,witl1: a

seini cyIindrlcalrecess 2Pinfthe;body portion Y Ofthe. ater... Theflsemircylindrical} recess 11 isthreadedto,receiveithethreads off an adjustingscrew, 1'2' ,,The latter; is provided with a reduced portion 1 2" ii1' to which a: 1

tongue. 13 of the slidable blockfi.enters. It

will be'seenthatfany,.lptati'on'oizfthev screw 12L will'jcause acorreslirolldii g."movement of the l ck e dlthaiaw ret an m- Disposed screw 15Lbearingaagea1il6 I ichiis adapted to turnIin tummy portions 17 and; 1 .8' of thefback. j'awll. the gchuckhody" portion 2;.ire ii r y; bihg P a ed; fro lollgir tndinalf; movem"en't fby. the walls iof'lthe recess 18, .is clearly, shown i nea em ntw h,

nli gure The wal btfthe back ja 11 are threaded to engage] with the threads oi thescrew 15.

The b y oferq wrfies atel e al P lt OH ur niwhie s"mou -a ear U Surrounding this'f inner. portion 20 of a spider. The outer port'ion 21bit the spider is connected to the portion 20 by pins which isarrange to the gear 16.

22 and also by webs 23, see Figure 4. Upon these pins are mounted. spurgears 24. and 25, respectively. Thereare a number of sets of these gears 24:.and 25, two of them: being I indicated in Figure. 4. I j- Encircling the spider portion 20 is 'an'in ternal ring gear 26 arrangedito mesh with" the gear 25. Am'internal gear 27 hasteeth arranged to mesh with the gear 2431K]. is recessed to receive thespider portion 21. This gear 27 hasattached to it a dog 28 arranged to enter between the fingers 29-of the lathe block 1 so as to keep the gear 27 from turning. At 30 I have shown a hub gear which which a spanner wrench may be used for screwing the nut on or oil".

is keyed to the body portion 2 of the chuck and which engages the gear 24. A nut "31' is screwed on to the body portion .2 which is provided with openings 32 'by means 'of From --the foregoing description of the various parts of the'device, the operation thereof may be readily understood. As will be observed from Figure 1, the ring gear 26 is provided with a handle 33. The construction involves the use of planetary gearing. Consider now conditions when the lathe is idle andthe handle is moved outwardly from the plane of the paper shown in Figure 1.; This will turn the ring gear 26, which willcause a movementof the gear around the pin 22. The latter is stationary, being held sobyltheengagement of the teeth of the gear 24. With the teeth of the ring gear 27 on one side, and with the teeth of the hub gear 3 ()'on the other. The rotation of the gear 25 will drive the gear 19 in the opposite direction from the gear 26, and will turn the gear l6'and hence'the screw 15, thus causing the back jaw 11 to move inwardly and to carry withit'the parts attached thereto, i. e., thescrew 12,'the slidable block 6, and the jaw members 5.

revolve between the stationary gears 26 and 27 and the revolving gears 19 andBO, and the spider revolves in relation to the stationary and revolving gears.

. When itis desired to ad ust the, jaw mem hers 5 it may be done by. turning the adjust- I ing screw 12 which will cause an inward or outward movement, according to the direction in which theadjusting screw is turned.

The slidable members 5 are reversible, as

shown in Figure';5,in which the longer bolt 8 is at the top and the shorter bolt 7 at the bottom.

The arrangements described provides a means foraccuratelyinoving the jaws simultaneously, and to the same extent, by the movement of the handle or lever 33. Unlike the devices of the type which operate on the cam principle, the present device provides means for instantly releasing the work. In those devices which operate on the cam principle, it has been found necessary to use a tool to strike'the handlefsince there is a wedging action in devices which operate on the cam principle, which is' absent in the present structure. The arrangement of the gears forms a means by which powerful pressure may be exerted to firmly clamp the work.

I claim 1. A lathe chuck comprising a body portion, a plurality of jaw actuating screws carried by said .bodyportiom'a gear carried by each jaw actuating screw, a driving gear mounted for rotation on said chuck body and arranged to simultaneously actuate each of said first named gears,'a ring gear, and intermediate planetary gearing between said ring gear and said driving gear for transmitting the movement of the ring gear to the driving gear to regulate the position of the jaws, said planetary gearing permitting the rotation of the chuck body, irrespective of the position of the jaws.

2. A lathe chuck comprising a body por- I tion, a plurality of jaw-actuating screwscarried by said body portion, a gear carried by each aw-actuating screw, a driv ng gear mounted for rotation on said chuck body and arranged to simultaneously actuate eacl of said first named gears, a stationary gear,

a ring gear movable relative thereto and provided with a handle,and planetary gearing associated with said stationary gear-and said ring gear for transmitting movementof the ring gearto the drivinggear to regulate 

